I've always seen tech death as having two waves. First, there were the older bands that pioneered it in the early 90s, primarily Death, Cynic, Atheist, and Nocturnus. These bands put a technical (or progressive) spin on the classic death metal sound, but for the most part, their music was more death metal than it was progressive. Then we have the newer bands, the "second wave," (Obscura, Necrophagist, Beyond Creation, The Faceless, etc) who in a way flipped that on its head, and made the genre become a bit more… evolved, for lack of a better word. For those who have become accustomed to Obscura's sound on Cosmogenesis and Omnivium, you're a little out of luck finding it on their debut. Retribution is something of an homage to the classic tech death sound, particularly that of Death (*hint hint* "Lack Of Comprehension" cover). It's nowhere near as advanced as Obscura's more recent work, but it certainly isn't a bad release either.